Sheet-metal-shaping means.



L. BAUROTH.

Patented Feb. 23, 1915.

WITNESSES: @G01/MZ d. z; @uw

H. WACKER, F

SHEET-METAL-SHAPING MEANS.

Specification of Letters Patent.

Patented Feb. 23, 1915.

Application lednpril 24, 1918. Serial No. 763,236.

T0 all whoa z't may concern Be it known that I, LEONHARD. BAUROTH,

a citizen of the United States, and a resident of Toledo, in the county of Lucas and State of Ohio, have invented a certain new and useful Sheet-Metal-Shaping Means; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which .it appertains to make and use the same, reference being had to the accompany ing drawings, and to the characters of reference marked thereon, which form a part of this specification.

This invention relates to sheet-metal drawing or shaping means, and particularly to means for acting on the walls of hollow or cup-shaped articles to provide them with outwardly drawn or expanded portions, suc-li, `for instance, as annular beads, but is not restricted to such use, as it may be used for any purpose for which it may be adapted or appropriate.

The object of my invention is the provision of improved means of the character described, which is simple and inexpensive in its construction, positive in its operation and capable of expanding or drawing the side wall of a hollow article into any desired shape or configuration upon a changing of the expandingdies to suit the shape desired.

A further object of my invention is to simplify and cheapen the methods now employed for the shaping of articles of this class.

rlhe invention is fully described in the following specification, and While, in its broader aspect, it is capable of embodiment in numerous forms, a preferred embodiment thereof is illustrated in the accompanying drawings, in which,-

Figure 1 is a sectional elevation of a matrix and expanding die embodying the invention with such parts in separated position and with awork blank disposed in the matrix. Qis a similar view thereof with the male or expanding die in expandingiposition within the matrix, and Fig. 3 is a section on .the line in Fig. 2.

Referring to the drawings, A designates) the matrix and B the male or expanding die. The matrix A, in the present instance, comprises a base member 1 and upper sectional part 2, the sections or jaws of which are pivoted together, as at 3, for relative opening and closing movements transversely of the axis of the work blank receiving cavity 4 therein. The cavity 4; extends entirely through the section 2 and partially into the matrix section 1, and is shown as having an annular wall-recess or groove 5 therein into which a registering portion of a work blank 6 may be drawn or expanded to provide a circumferential ridge thereon. The joint between the upper and lower sections of the matrix intersects the recess 5` substantially centrally of its edges to permit the withdrawal of a drawn work piece upon an outward openingl of the jaws of the section 2 for such purpose, as is apparent. The jaws of the matrix section 2 are secured together` l in closed position by a lever or locking member 7, which is pivoted, in the present instance, to the free end of one jaw and has a pin 8 for locking coaction with the outer side of the free end of the outer jaw when the lever is in the locking position shown in Fig. 3. y

The male or expanding die B comprises, in the present instance, the upper and lower body sections 9 and 10, respectively, which are yieldingly spaced apart by coiled compression springs 11 mounted in registering sockets in their adjacent faces, and have their relative outward movements limited by stop screws 12 which thread into the lower or inner side of the section 9 and have their headed ends working in shouldered sockets in the section 10. The bottom or outer side of the section 10 is preferably shaped in complemental relation to the bottom of the matrix cavity 4 and the two sections 9 and 10 have their side edges oppositely beveled or tapered, as indicated at 13, 13, which beveled surfaces, if annular or circumferential ridges are to be formed on a blank, coperate to provide the die B with a surrounding or annular groove substantially V-shaped in cross-section.

An expanding die 14: is mounted between the beveled side edges 13 of the upper and lower body sections 9 and 10 entirely around the same, and is composed of a plurality of sections or blocks 14a, which are retained in assembled relation relative to the sections 9-10 byra coiled contractile spring-ring 15, which extends through registering transverffae openings in the blocks 14CL as best shown in Fig. 3. The sections ofthe expanding die 14 are adapted to normally lie in laterally abutting relation around the body sections 9-10, and each has its inner side formed with oppositely tapered surfaces which are complemental to the surface 13-13 of the sections 9-10, whereby a relative contraction of the sections 9-10 will have an outward wedging or expanding action on the sections of the expanding die 14. The outer sides or edges of the expanding die sections 14a are shaped in complemental relation to the portions of the side wall of the matrix cavity 4 with which they respectively register when lowered into the matrix, whereby an expanding of the die 14 within the matrix will effect an outward drawing of the side walls of the work blank into the side recesses or grooves in said cavity.

It will, of course, be understood that upon a lowering of the die B into the matrix cavity, the upper section 9 of such die continues its movements for a short distance after the movement of the lower section 10 has been stopped by the opposing action of the matrix bottom, thus imparting .outward expanding movements to the sections 14a of the expanding die to effect a desired shaping of the side walls of a' work-piece 6. During the initial portion of an outstroke of the die B the body section 9 recedes from the section 10, due to the expanding action of the interposed springs 1l, thus permitting the die sections 14a to be retracted to collapsed position by the action thereon of the spring 15 preparatory to a withdrawal of the die B fromwithin the expanded Work-piece. The removal of an expanded work-piece 6 from the matrix may be accomplished upon an opening of the jaws of the upper matrix section 2 for such purpose. Itis evident that the relative positions of the expanding die sections 14L depends entirely upon the desired expanded configuration of the work-piece,'and that such sections may be continued entirely around the male die, as in the present instance, or only partially around the same, or arranged in spaced relation as the portions of the workpiece to be expanded may require; and also, that the work coacting sides of the die sections may be shaped in conformance to the portions of the matrix cavity wall with which they respectively coact in the shaping of a Work-piece.

I wish it understood that my invention is not limited to any speoiiic construction or arrangement ofthe parts except in so far as such limitations are specified in the claims.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In combination, a matrix, a plunger having parts which are caused to have positive relative movements upon a movement of the plunger into the matrix, said parte having opposing die engaging surfacesl and. an expanding die carried by said parts in engagement with said surfaces and caused to have an expanding movement upon a relative movement of the plunger parts in one direction.

2. In combination, a plunger having yieldingly-spaced relatively-movable parts,

and a die carried by the plunger in wedge coaction with the parts thereof whereby a relative inward movement of the parts imparts an outward expanding movement to thev die.

3. In combination, a plunger having parts mounted for relative axial movements, a die carried by the plunger in coaction with said parts and radially movable relative thereto `upon a relative movement of the parts from normal position, and spring means for retracting the die upon a relative movement of the plunger parts from die expanding position.

4. In combination, a plunger having parts mounted 4for relative axial movements and yieldingly spaced, a plurality of dies car-- ried by the plunger in coaction with the parts thereof and being caused to have expanding movements imparted thereto upon a relative contraction of the plunger parts, and means for retracting said dies upon a separation of said parts.

5. In combination, a plunger having a plurality of relatively movable parts cooperating to form a substantially V-shaped groove between adjacent edge portions thereof and mounted in said groove, the sections thereof being caused to have expanding movements relative to the plunger when one of said partsis moved in one direction relative to the other, and yielding means for retracting the die sections upon a movement of such part in the opposite direction relative to its member.

6. In combination, a plunger having parts which are relatively movable in an axial direction and having their adjacent'edges oppositely tapered to form a surrounding groove, means normally influencing a relative outward movement of said parts, means limiting such outward movements of the parts, a die encircling the plunger within said groove and having a plurality of adjoining sections which have surfaces com- Maase@ piementa to the tapered surfaces of saic signed my name to this specication in the parts and are caused to have outward expresence of two subscribing witnesses.

panding movements upon a relative inward movement of said parts, and means yield- LEONHARD BAURGTH' .5 ingly retaining the diesections in contract- Witnesses:

ed relation. S. T. KLo'rz,

En testimony whereof, 3i have hereunto E., E. THOMAS. 

